Process for the manufacture of fibers, tape, etc., from viscose



Patented Mar.- 2,. 192 6.

UNITED STATES- anomr mm, or ranmmrz,

PATENT QFFICE.

WESTHAVELLAN D, GERMANY.

No Drawing. Application filed May 7,

To all whom it may concern: Be it known that I, ADOLRKKMPF, a citizen of Germany, and a resident of Premnitz, Westhavelland, Germany, have invented oer.- 6 tain new and useful Improvements in Proc 'esses for the Manufacture of Fibers, Tape, Etc, from Viscose, of which the following is a specification.

With the familiar spinning baths for the 10 manufacture of art silk, ribbons, horse hair and the like, either organic substances or salts of some kind are added to the acidulous bath, resulting in a' higher spinning bath temperature, for instance from LO-50".. The

admixture of the aforementioned chemicals increases the cost of the spinning bath.

It has now been found that for many cases, particularly for viscose of a low degree of ripening or completely unripened viscose,

better results may be produced by the use of particularly cold spinning baths, which contain organic bodies or salts only to the extent in which they find their way into the bath by the spinning process of viscose in mineral acidulous baths and again and again repeated refre-shening of these baths by addition of acid. e

For instance completely unripened viscose,

' derived from completely unripened alkaline 3 cellulose, is squirted from a nozzle of 0.13

mm. diameter into a sulphuric acid bath containing besides 15% sulphuric acid 5% sodium su phate, at a temperature .of 4 in the spinning bath. The length of the spinning bath may be 60 mm, the drainage speed 55 in. per minute. The fiber forms uninterruptedly and can be wound up without further trouble. It must, however, be left for a cer- 1923. Serial No. 637,374..

tain time to a supplementar coagulation on the reel in the adhering aci in order to become insoluble in water. This'is not the case with the application of higher temperatures.

The fiber obtained in the first mentionedmanner distinguishes itself in a remarkable mannerin point of lustre, softness and firmness from the latter named fiber.

Having thus more particularly described and ascertained the nature of my invention and in what manner the same is to be performed, I declare that what I claim is:

1. The method of making cellulose products from viscose that comprises spinning unripened viscose in an acid bath having a temperature of about. 41. C.

2. The method of making cellulose products from viscose that comprises producing completely unripened viscose from completely unripened alkaline cellulose, and spinning the unripened viscose in an'acid bath having a temperature under 10 (1, the bath containing organic bodies or salts only to the extent in which they find their Way into the bath by the spinning process.

3. The method of making cellulose products from viscose that comprises producing 05 completely unripened viscose from completely unripened alkaline cellulose, and spinning the unripened viscose in an acid bath having a temperature of about 4 (1, the bath containing organic bodies or salts only to the extent in which they find their way into the bath by the spinning process.

In testimony whereof, I have hereunto subscribed my name this 14th day of April, 1923.

Doo'ron ADOLF KAMPF. 

